2 Answers

It sounds like the starter selinoid is bad, if starts
here and there it is on its way out and finally died
,with car OFF.... take starter conceptions and touch
with metal, wrench, alagators clips whatever you
can, if starter spins, then is the selinoid

Need to know a little more info. Does it make any noise when it fails like a single click, fast clicking, nothing at all?
If it makes no noise at all, could be the neutral safety switch. Try moving the shifter to N or push back in Park. This safety switch will disable the starter so the card doesn't start in gear.

My 2007 Grand Cherokee Laredo 3.7 V6 starts fine when engine is cold, but after it warms up ,the engine will start, but starter won't disengage from the flywheel. Let it sit for 30-40 minutes to cool...

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